A challenge: make an online Lua tutorial

[steve donovan <steve.j.donovan@...>]

This challenge is inspired by the interactive Go tutorial:

http://go-tour.appspot.com

Not only good presentation and clever technology, but the tutorial
format works well.

(Yes, I do know that there are several try-lua sites; there was even
an online interpreter. It's the integration with learning which is
impressive here)

steve d.